Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757308AbXHTLxN (ORCPT ); Mon, 20 Aug 2007 07:53:13 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750987AbXHTLw5 (ORCPT ); Mon, 20 Aug 2007 07:52:57 -0400 Received: from moutng.kundenserver.de ([212.227.126.186]:61779 "EHLO moutng.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751066AbXHTLw4 (ORCPT ); Mon, 20 Aug 2007 07:52:56 -0400 From: Bodo Eggert <7eggert@gmx.de> Subject: Re: [PATCH] Make checkpatch rant about trailing ; at the end of "if" expr To: Jan Engelhardt , Andy Whitcroft , Eugene Teo , linux-kernel@vger.kernel.org, auke-jan.h.kok@intel.com Reply-To: 7eggert@gmx.de Date: Mon, 20 Aug 2007 13:52:35 +0200 References: <8SGSb-2Kk-9@gated-at.bofh.it> <8SJQ6-7pj-13@gated-at.bofh.it> <8T8Oy-3D0-13@gated-at.bofh.it> User-Agent: KNode/0.7.2 MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8Bit Message-Id: X-be10.7eggert.dyndns.org-MailScanner-Information: See www.mailscanner.info for information X-be10.7eggert.dyndns.org-MailScanner: Found to be clean X-be10.7eggert.dyndns.org-MailScanner-From: 7eggert@gmx.de X-Provags-ID: V01U2FsdGVkX1/Rc0z5qn0412+Hq9DPtBoolSj8MUE/Iiqta6d VbutD6QXwlbCtxO3or6POfZR4+2qI/k4VrpfJXnCXV7I2mXYSV 8qUQ3q0FYke59BBzJBl+Q== Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1345 Lines: 30 Jan Engelhardt wrote: > On Aug 16 2007 10:21, Andy Whitcroft wrote: >>> + if ($line =~ /\bif\s*\([^\)]*\)\s*\;/) { >> >>Heh, you are the second person to suggest this check today, do I detect >>some ripped out hair due to one of these! >> >>I've taken this idea and expanded it to cover if, for and while which >>can all suffer from this. Using the relative indent to work out which >>are valid combinations: > > But. The above regex does not seem to handle > > if ((a = b)); > oops; > > I have tried to come up with a superduper regex that handles multiple > (), but my regex fu seems to stop above two pairs of (). This is because you can't do that using finite regular expressions. Regular expressions are Type-3 grammars, but you'd need a Type-2 grammar to express the Dyck language (and you need to parse a Dyck Language, ignoring the non-dyck-parts). -- Your e-mail has been returned due to insufficient voltage. Fri?, Spammer: xVhgayew@6yAk1Uy.7eggert.dyndns.org G2@7eggert.dyndns.org MVt59@gcEE.7eggert.dyndns.org GBwox2uHv@mb.7eggert.dyndns.org - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/